J. Mater. Sci. Technol. ›› 2025, Vol. 213: 118-124.DOI: 10.1016/j.jmst.2024.06.027

• Research Article • Previous Articles     Next Articles

Facet orientation control of tin-lead perovskite for efficient all-perovskite tandem solar cells

Yulin Wua,b, Shan Wuc, Jinyao Wanga,b, Jiangying Luc, Xu Zhenga,b, Shudi Lud, Shizhong Yuea,b, Kong Liua,b,*, Zhijie Wanga,b,*, Shengchun Qua,b,*   

  1. aLaboratory of Solid-State Optoelectronics Information Technology, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
    bCenter of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
    cDepartment School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;
    dDepartment of Physics, Hebei Normal University of Science & Technology, Qinhuangdao 066004, China
  • Received:2024-03-06 Revised:2024-05-04 Accepted:2024-06-04 Published:2025-04-01 Online:2025-04-01
  • Contact: *E-mail address: liukong@semi.ac.cn (K. Liu), wangzj@semi.ac.cn (Z. Wang), qsc@semi.ac.cn (S. Qu)

Abstract: Developing high-performance narrow-bandgap (NBG) perovskite solar cells based on tin-lead (Sn-Pb) perovskite is critical for the advancement of all-perovskite tandem solar cells. However, the limitations of the device current density and efficiency are magnified by the issues concerning poor carrier transport caused by a substantial number of defects in thick NBG films. This problem is further exacerbated by the quality of film crystallization, which is associated with the rapid and uncontrolled crystallization of Sn-rich perovskite chemistry using the antisolvent approach. We regulate the crystallization of Sn-contained perovskite with a mild gas-quench approach to fabricate a highly crystal-oriented and well-arranged NBG perovskite absorber. This strategy effectively boosts electron transport and light absorption of the NBG perovskite. Consequently, the average power conversion efficiency (PCE) of the NBG perovskite solar cells increases from 19.50 % to 21.18 %, with the best device achieving an excellent PCE of 21.84 %. Furthermore, when combined with a wide-bandgap perovskite subcell to form an all-perovskite tandem solar cell, a PCE of 25.23 % is achieved. After being stored in the glovebox for 1000 h, the unencapsulated device maintains over 90 % of its initial PCE, demonstrating long-term stability and durability. This work presents a promising approach for developing high-efficiency NBG perovskite solar cells.

Key words: Sn-Pb perovskite, All-perovskite tandem solar cells, Facet orientation, Crystal plane stacking